Study on broadband low-temporal-coherence optical parametric amplification based on 58% deuterated DKDP crystal
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摘要: 低相干激光驱动器作为新型激光驱动器可抑制激光等离子体不稳定性，在激光惯性约束聚变领域具有重要研究价值。为实现大带宽高功率低相干脉冲参量放大，详细分析了I类共线匹配方式下不同氘化率的 DKDP 晶体参量匹配特性，给出了相位匹配角、走离角、参量带宽等基本匹配参数，得到掺氘量58%DKDP晶体的理论支持参量带宽约为180 nm。在此基础上，基于掺氘量58%的DKDP 晶体进行了宽带时间低相干光参量放大设计，结合三波耦合方程组建立了参量放大的理论模型以及相应的数值分析模型。同时开展了58%DKDP晶体参量放大实验，宽带低相干信号光中心波长为
1053 nm，泵浦光波长为532 nm，在2.1倍的增益倍率前提下光谱宽度为40 nm。结果显示，58%DKDP晶体具有很大的增益带宽，结合共线相位匹配方式，有望实现低相干光大带宽高增益放大。Abstract: As a new type of laser driver to suppress laser plasma instability, the low-coherence laser driver holds significant research value in the field of laser inertial confinement fusion. To achieve large-bandwidth and high-power low-coherence pulse parametric amplification, this study provides a detailed analysis of the parametric matching characteristics of DKDP crystals with varying deuteration rates under Type-I colinear phase matching conditions. The fundamental parameters, including phase-matching angles, walk-off angles, and parametric bandwidths, are determined. The theoretical parameter bandwidth of the 58% deuterium-doped DKDP crystal is 180 nm. On this basis, a design for broadband low-temporal-coherence optical parametric amplification based on 58%DKDP crystals is proposed, and the theoretical model and the corresponding numerical model are established by the three-wave coupled equations. Furthermore, an experimental investigation of parametric amplification based on 58%-deuterium-doped DKDP crystals is conducted. The center wavelength of the broadband low-coherence signal light is set at1053 nm, while the pump wavelength is fixed at 532 nm. The spectral width is 40 nm with a gain factor of 2.1. The results show that 58% DKDP crystal has a large gain bandwidth, and combined with the colinear phase-matching method, such crystals are expected to enable large-bandwidth and high-gain amplification of low-coherence light. -
图 3 接受带宽和走离角随掺氘量的变化关系
Figure 3. Variation relationships between parametric bandwidths、walk-off angles and deuterium doping level
图 4 OPA 过程的数据模拟结果
Figure 4. Numerical simulation temporal characteristics of OPA processes
图 5 不同泵浦强度下的 OPA 模拟结果
Figure 5. Simulation temporal characteristics of OPA processes under different pump intensities
图 8 信号光放大倍数随晶体转动角度的变化关系
Figure 8. Variation of signal magnification with external angle
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